60 



PSYVIIOLOOT. 



abolished.* Luciaui found it diminislied in his three ex- 

 periments on apes.f 



In man we have the fact that one-sided paralysis from 

 disease of the opjjosite motor zone may or may not be 

 accompanied with ana3sthesia of the parts. Luciani, who 



Fig. 20.— Luciani's Tactile Region in the Dog. 



believes that the motor zone is also sensory, tries to minim- 

 ize the value of this evidence by pointing to the insufficiency 

 with which patients are examined. He himself believes that 

 in dogs the tactile sphere extends backwards and forwards 

 of the directly excitable region, into the frontal and parietal 

 lobes (see Fig. 20). Nothnagel considers that pathological 

 evidence points in the same direction ; \ and Dr. Mills, care- 

 fully reviewing the evidence, adds the gyri fornicatus and 

 hippocampi to the cutaneo-muscular region in man.§ If one 

 compare Luciani's diagrams together (Figs. 14, 16, 19, 20) 

 one will see that the entire parietal region of the dog's skull 

 is common to the four senses of sight, hearing , smell, and 

 touch, including muscular feeling. The corresponding re- 

 gion in the human brain (upper parietal and supra-marginal 

 gyri — see Fig. 17, p. 56) seems to be a somewhat similar 

 place of conflux. Optical aphasias and motor and tactile 

 disturbances all result from its injury, especially when that is 

 on the left side. II The lower we go in the animal scale the 



* Pp. 15-17. f Luciani u. Seppili, op. cit. pp. 275-288. 

 X Op. cit. p. 18. § Trans, of Congress, etc., p. 272. 



I See Exner's Unters. lib. Localization, plate xxv. 



